Unfortunately, I don't seem to have that option any more. My cable modem
appears only to expose a layer 4 connection.
Previous version of my router appear to have a "modem mode" but that
doesn't exist in my version.
Here in Australia we have a national operator called NBN that
runs its own country-wide network and provides the Network
Termination Devices to every household and business.
Then we have a large number ISPs who connect to NBN and have a
virtual circuit established between them and each individual
customer. It is up to each ISP what services they provide. As a
customer you are virtually connected to an ISP router and have no
exposure to the network inbetween - which could be DSL or cable or
fibre or even wireless.
What you see is what your ISP wants you to see. Some of them add an extra box between you and the NTD to make it harder (allegedly easier for them to manage it better, actually to lock you in).
You have the option of changing ISP to one that provides correct IP services. That may include chucking out any extra box and connecting direct to the NTD.
Here is something I found about the UK. OpenReach sounds very similar to NBN
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Here's an overview of the broadband options and market structure in the UK:
Openreach: Openreach, a subsidiary of BT Group, owns and operates the majority of the UK's fixed-line infrastructure, including copper lines, fiber-to-the-cabinet (FTTC) connections, and fiber-to-the-premises (FTTP) connections. Openreach is regulated to provide access to its infrastructure on a wholesale basis to other ISPs. This means that multiple ISPs can offer services to consumers using Openreach's infrastructure, with virtual circuits connecting customers to their chosen ISP. Major ISPs, such as BT, TalkTalk, Sky, and Plusnet, use this infrastructure.
Virgin Media: Virgin Media is the largest cable broadband provider in the UK, operating its own network separate from Openreach's infrastructure. Virgin Media's network is based on Hybrid Fibre-Coaxial (HFC) technology, which delivers high-speed internet using a combination of fiber-optic and coaxial cables. Virgin Media is not obligated to provide wholesale access to its network, meaning customers can only access services directly from Virgin Media.
Smaller ISPs and Alternative Networks: There are also smaller ISPs and alternative network providers that offer broadband services, including full-fiber networks, fixed wireless access (FWA), and satellite broadband. Some of these providers, like CityFibre, Hyperoptic, and Gigaclear, have built their own infrastructure in certain areas, while others lease capacity from Openreach or other network operators.
Mobile Broadband: Major mobile network operators, such as EE, Vodafone, O2, and Three, offer mobile broadband services using 4G and 5G technologies. These services can be used as a primary broadband connection, especially in rural areas where fixed-line broadband speeds may be limited.
In summary, the UK broadband market is a mix of infrastructure providers and ISPs, with Openreach's wholesale model playing a significant role in ensuring competition among ISPs. Additionally, Virgin Media, smaller ISPs, and mobile network operators provide alternatives to the Openreach infrastructure.
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-- Jeremy (Lists)